Description
Product Name: 3TF4222-OAMO SIEMENS Central control module
Product details:
The Siemens 3TF4222-0AM0 is a power contactor from the older 3TF series. Contactors are electromechanical switching devices used for switching power circuits, mainly to control electric motors, heating, lighting, and other high-current loads.
- Type: 3-pole AC Contactor
- Size: Typically belongs to the Size S1 (based on the series and capacity)
- Main Function: Switching and controlling three-phase electric loads.
- Coil: The -0AM0 suffix specifies the coil operating voltage (the ‘A’ often indicates a specific AC voltage, e.g., 230V AC or similar, but the exact voltage must be confirmed from the complete ordering code).
- Auxiliary Contacts: Includes built-in auxiliary contacts for signaling and interlocking in the control circuit. The ’22’ in the middle of the code typically indicates the number of auxiliary contacts (e.g., 2 Normally Open (NO) and 2 Normally Closed (NC)).
2. Product Parameters (产品参数)
The following are typical technical specifications for a 3TF42 contactor (Size S1):
| Parameter | Typical Value (based on 3TF42) | Notes |
| Rated Operational Current ($I_e$) | $16 \text{ A}$ (at $AC-3, 400 \text{ V}$) | For inductive loads like motors (AC-3 duty). |
| Rated Power ($P$) | $7.5 \text{ kW}$ (at $AC-3, 400 \text{ V}$) | Maximum motor power that can be switched. |
| Control Circuit Voltage ($U_s$) | Specified by the -0AM0 suffix. | Must be confirmed (e.g., $230 \text{ V} AC, 50/60 \text{ Hz}$). |
| Rated Insulation Voltage ($U_i$) | $690 \text{ V}$ or higher | Maximum safe voltage between terminals. |
| Auxiliary Contacts | $2 \text{ NO} + 2 \text{ NC}$ (Typically for ’22’ in the code) | Used in the control circuit. |
| Terminal Type | Screw terminals | For reliable wire connection. |
| Mounting | $35 \text{ mm}$ DIN rail or screw fixing | Standard industrial mounting options. |
3. Product Advantages (产品优势)
- Robust and Reliable: Built for long service life and high switching frequency in demanding industrial environments.
- Proven Technology: Part of Siemens’ established and globally recognized power control equipment.
- High Performance: Excellent making and breaking capacity for motor control applications (AC-3 duty).
- Modularity: Compatible with various add-on accessories (like thermal overload relays, auxiliary contact blocks, etc.) from the same series.
- Compact Design: Optimized size for space-saving installation in control panels.
4. Precautions (注意事项)
- Correct Coil Voltage: Crucial. Ensure the control voltage ($U_s$) supplied to the A1/A2 terminals exactly matches the coil voltage specified by the -0AM0 variant. Incorrect voltage will damage the coil.
- Overload Protection: The contactor itself does not provide motor overload protection. A separate thermal overload relay (e.g., Siemens 3RU series) must be installed in series with the contactor to protect the motor from overheating.
- Wiring: Use the correct wire sizes according to the rated current and local electrical standards. Ensure all screw terminals are properly torqued.
- Installation Environment: Install in a clean, dry, and vibration-free environment, inside a suitable enclosure with adequate ventilation.
- Safety: Always disconnect the power supply before performing any installation, maintenance, or wiring work.
5. Product Applications (产品应用)
The 3TF42 contactor is primarily used in industrial and commercial electrical control systems for:
- Motor Control: Switching three-phase squirrel-cage motors (Direct On-Line (DOL) starters).
- Lighting Systems: Controlling large banks of industrial or commercial lighting.
- Heating Loads: Switching resistive loads such as industrial heaters or furnaces.
- Capacitor Banks: Switching power factor correction capacitor banks (requires specialized contactors with damping resistors, but the basic 3TF can be used for smaller loads).
- General Power Switching: As a main or auxiliary power switching device in various machinery and electrical distribution boards.
Advantages: Foxboro, OVATION, TRICONEX, Allen-Bradley, ABB, Motorola, Siemens Moore, Ge Fanuc, Woodward, Bently Nevada and other major import brands!
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Colour：new Warranty: 12 months
Lead Time：3-day working day Country of origin: Sweden
Price: Please contact us Product weight：0.515kg
Shipping Port: Xiamen, China
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